| 摘要 |
<p>The device includes an electrostatic gun which is essentially constituted by a first tubular body (3) contained in a second outer tubular body (15) made of a material which is porous with regard to air. The interspace (19) defined between the first body and the second outer body is kept at a pressure higher than the ambient pressure, so as to prevent powder from depositing on the outer body. <IMAGE></p> |
